Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2018	$ 287	$ (1,680)	$ 175,820	$ (158,981)	$ 32,938
Balance, shares at Dec. 31, 2018	2,877,000	7,000
Common stock issued	$ 1				1
Common stock issued, shares	9,000
Restricted stock issued
Restricted stock issued, shares
Common stock issued through market sales
Common stock issued through market sales, shares
Common stock issued through offerings	$ 94		5,868		5,962
Common stock issued through offerings, shares	933,000
Extinguishment of Series A Shares
Beneficial Conversion Feature in connection with Series B Issuance
Amortization of Beneficial Conversion Feature
Treasury stock purchased		$ (32)			(32)
Treasury stock purchased, shares		3,000
Stock-based compensation expense			266		266
Adoption of ASC 842				55	55
Net loss				(3,326)	(3,326)
Balance at Mar. 31, 2019	$ 382	$ (1,712)	181,954	(162,252)	18,372
Balance, shares at Mar. 31, 2019	3,819,000	10,000
Balance at Dec. 31, 2019	$ 393	$ (1,721)	182,514	(185,665)	(4,479)
Balance, shares at Dec. 31, 2019	3,932,000	12,000
Common stock issued	$ 1				1
Common stock issued, shares	37,000
Restricted stock issued
Restricted stock issued, shares	6,000
Common stock issued through market sales	$ 8		476		484
Common stock issued through market sales, shares	80,000
Common stock issued through offerings
Common stock issued through offerings, shares
Extinguishment of Series A Shares			(828)		(828)
Beneficial Conversion Feature in connection with Series B Issuance			2,205		2,205
Amortization of Beneficial Conversion Feature			(2,205)		(2,205)
Treasury stock purchased
Treasury stock purchased, shares
Stock-based compensation expense			418		418
Adoption of ASC 842
Net loss				(6,494)	(6,494)
Balance at Mar. 31, 2020	$ 402	$ (1,721)	$ 182,580	$ (192,159)	$ (10,898)
Balance, shares at Mar. 31, 2020	4,055,000	12,000